Bonjour
Calculer la longueur manquante :
JL^2 = JK^2 + KL^2
8,5^2 = JK^2 + 3,6^2
JK^2 = 8,5^2 - 3,6^2
JK^2 = 72,25 - 12,96
JK^2 = 59,29
JK = V(59,29)
JK = 7,7 cm
AC^2 = AB^2 + BC^2
AC^2 = 6,4^2 + 7,2^2
AC^2 = 40,96 + 51,84
AC^2 = 92,8
AC = V(92,8)
AC ~ 9,6 cm